Access Network for Mobile Telecommunications and Method for Developing Radio Coverage

1. A telecommunications network for mobile phone users comprising a user subsystem and a transport subsystem associated by means of an access subsystem, which connect to them respectively through a user-access communication interface and a transport-access communication interface suitable to allow the exchange of data flows between said subsystems, said access subsystem identifying a coverage area of the telecommunication network for mobile users and comprising bidirectional radio base stations and monodirectional radio base stations wherein at least a part of the uplink communications between said user subsystem and said access subsystem are implemented by means of monodirectional radio base stations dedicated only to uplink coverage, said monodirectional radio base stations dedicated only to uplink coverage using a technique of transmissions separated in frequency for communicating with said user subsystem, said monodirectional radio base stations dedicated only to uplink coverage being located in the coverage area of the mobile telecommunications network.

2. A telecommunications network for mobile phone users according to claim 1 wherein at least a part of the downlink communications, that is communications from the radio base station to the mobile phone user, are implemented by means of monodirectional radio base stations dedicated only to downlink coverage, said monodirectional radio base stations dedicated only to downlink coverage using a technique of transmission separated in frequency, said monodirectional radio base stations dedicated only to downlink coverage having means to communicate with radio network controllers.

3. A telecommunications network for mobile phone users according to claim 1 wherein said monodirectional radio base stations dedicated only to uplink coverage comprise means to communicate with radio network controllers in the FDD technique.

4. A telecommunications network for mobile phone users according to claim 1 wherein said access subsystem comprises radio network controllers that comprise means to communicate with said monodirectional and bidirectional radio base stations.

5. A telecommunications network for mobile phone users according to claim 1 wherein said monodirectional and bidirectional radio base stations comprise means to communicate with the user subsystems, and that the user subsystems comprise means to communicate with said monodirectional and bidirectional radio base stations.

6. A telecommunication network for mobile phone users according to claim 1 wherein said monodirectional radio base stations dedicated only to uplink coverage comprise means for providing one or more control channels, said control channels being of bi-directional or monodirectional type.

7. A telecommunications network for mobile phone users according to claim 1 wherein said monodirectional radio base stations dedicated only to downlink coverage comprise means for providing one or more control channels, said control channels being of bi-directional or monodirectional type.

8. A telecommunications network for mobile phone users according to claim 1 wherein the network is based on the UMTS standard and access subsystem is based on the UTRAN standard.

9. A telecommunications network for mobile phone users according to claim 1 wherein the network is based on the 3G standards that make up the IMT2000 family.

10. Method for developing cellular coverage for a telecommunications network for mobile phone users using a FDD technique comprising the steps of implementing the radio coverage by means of bidirectional and monodirectional radio base stations, wherein at least a part of the uplink communications, that is communications from the mobile phone user to the radio base station, are implemented by means of monodirectional radio base stations dedicated only to uplink coverage, said monodirectional radio base stations dedicated only to uplink coverage using a technique of transmission separated in frequency for said uplink communications, said radio base stations dedicated only to uplink coverage being located in the coverage area of the mobile telecommunications network.